lhquam is right ; I was avare of that from first moment when I go down with modulation ..... but I think it is small price having offset to gnd modulated with ripple , if we can go through just one core with signal

I love flaws. What about talking to BudP. Tell em what I need and I assume the third set is for the input pair. It will allow droppping the caps in signal path, correct. I thnk Jensen may have one already.

Just keep in mind that transformers are summing devices What one winding finds will affect all. All "secondaries" and "primaries" talk among themselves, so be very certain that you do not build a resonance circuit across 5 or more windings.

As an addendum, we don't usually build multifilar wound transformers. This format does provide nice, civil, linear responding devices, just like nice, civil, linear responding power transformers do. I prefer to make meta stable devices. They do not measure as well, they are not civil and they will respond to every half wave with the enthusiasm that linear transformers can muster for only the first half wave of any sinusoidal event.

Doesn't mean I won't make a 6 filar transformer. They will not oscillate in resonance, by the way. They will still be metastable, but the E Field coupling, hence ALL of the internal gradient information for tones and transients will be somewhat compromised.

Metastable here means always returning to B zero at the same time that H reaches zero, so every half wave has that funny looking little initiating squiggle that you see on the hysteresis plots of nice, civil, linear transformers for the initial movement from their rest. These squiggles are present for each half of a square wave also.....

Bud

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"You and I and every other thing are a dependent arising, empty of any inherent reality" Tsong Ko Pa